abates - 10:23 pm on Aug 6, 2006 (gmt 0)

I've been using session.use_trans_sid on a site for at least a year now with no impact in Google other than the removal of the session IDs.

The only way I can see Googlebot having trouble with this is if you require a session ID in order to view the site. If you can disable cookies in your browser and browse the site without problems, I can't see Googlebot having any trouble with it...